RFR: 8283056: show abstract machine code for all VM crashes [v2]

[Doug Simon]

> [JDK-8272586](https://bugs.openjdk.java.net/browse/JDK-8272586) added abstract assembly to hs-err for methods on the stack of the crashing thread. However, it only does this if the crash is due to an unhandled signal. It can also be useful to see assembly for crashes due to failing VM assertions or guarantees. This PR implements this improvement.

Doug Simon has updated the pull request incrementally with one additional commit since the last revision:

  moved fr declaration to block where it is used

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7791/files
  - new: https://git.openjdk.java.net/jdk/pull/7791/files/3ef8637d..a1adb8aa

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7791&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7791&range=00-01

  Stats: 4 lines in 1 file changed: 2 ins; 2 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7791.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7791/head:pull/7791

PR: https://git.openjdk.java.net/jdk/pull/7791